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Type: Prelims Only

  • CHIME Telescope

    Scientists with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Collaboration have assembled the largest collection of fast radio bursts (FRBs) in the telescope’s first FRB catalog.

    CHIME Telescope

    • CHIME is an interferometric radio telescope at the Dominion Radio Astrophysical Observatory in British Columbia, Canada.
    • It consists of four antennas consisting of 100 x 20-meter cylindrical parabolic reflectors with 1024 dual-polarization radio receivers suspended on support above them.
    • The telescope receives radio signals each day from half of the sky as the Earth rotates.
    • While most radio astronomy is done by swiveling a large dish to focus light from different parts of the sky, CHIME stares, motionless, at the sky, and focuses incoming signals using a correlator.
    • This is a powerful digital signal processor that can work through huge amounts of data, at a rate of about seven terrabytes per second, equivalent to a few percent of the world’s Internet traffic.

    What are FRBs?

    • FRBs are oddly bright flashes of light, registering in the radio band of the electromagnetic spectrum, which blaze for a few milliseconds before vanishing without a trace.
    • These brief and mysterious beacons have been spotted in various and distant parts of the universe, as well as in our own galaxy.
    • Their origins are unknown and their appearance is highly unpredictable.
    • But the advent of the CHIME project has nearly quadrupled the number of fast radio bursts discovered to date.
    • With more observations, astronomers hope soon to pin down the extreme origins of these curiously bright signals.

  • Glacier melting in Hindu Kush Himalayas

    Up to two billion people in southeast Asia can face food and water shortages even as the Hindu Kush Himalayan (HKH) mountain ranges lose up to two-thirds of its ice by 2100, a United Nations-backed research flagged.

    Hindu Kush Himalayas

    • The HKH region, often referred to as the ‘Third Pole’, is spread over 3,500 square kilometers across eight countries including India, Nepal, and China.
    • The range forms the western section of the Hindu Kush Himalayan Region (HKH) and is the westernmost extension of the Pamir Mountains, the Karakoram, and the Himalayas.
    • It divides the valley of the Amu Darya (the ancient Oxus) to the north from the Indus River valley to the south.
    • It contains the world’s third-largest storage of frozen water after the Antarctica and Arctic.
    • Over 240 million people live in the region’s mountains; 1.7 billion live in the river basins downstream, while food grown in these basins reaches three billion people.

    Continuous warming

    • HKH region continues to warm through 21st century even if the world was able to limit global warming at the agreed 1.5 degrees Celsius.
    • Another study published in 2019 on the ice thickness of glaciers had estimated that glaciers in the HKH may contain 27 percent less ice than previously suggested.
    • The HKH region lies downwind from some of the most heavily polluted places on Earth. This threatens agriculture, climate as well as monsoon patterns.

  • Places in news: Sardar Sarovar Dam

    The Sardar Sarovar Dam is providing irrigation water in summer for the first time in history.

    Sardar Sarovar Dam

    • The Sardar Sarovar Narmada Dam is a terminal dam built on the Narmada river at Kevadia in Gujarat’s Narmada district.
    • Four Indian states, Gujarat, Madhya Pradesh, Maharashtra and Rajasthan, receive water and electricity supply from the dam.
    • The foundation stone of the project was laid out by Prime Minister Jawaharlal Nehru on 5 April 1961.
    • The project took form in 1979 as part of a development scheme funded by the World Bank through their International Bank for Reconstruction and Development, to increase irrigation and produce hydroelectricity
    • Called the ‘lifeline of Gujarat’, it usually has no water for irrigation during summers.

    Answer this PYQ in the comment box:

    Q.Which one of the following pairs is not correctly matched?

     

    Dam/Lake River

    (a) Govind Sagar: Satluj

    (b) Kolleru Lake: Krishna

    (c) Ukai Reservoir: Tapi

    (d) Wular Lake: Jhelum

    A successful model of river water sharing

    • River Narmada is a classic case of Integrated River Basin Planning, Development, and Management, with water storage available in all major, medium, and minor dams on the main river and its tributaries.
    • Its water is shared amongst four party states – Gujarat, Rajasthan, Madhya Pradesh and Maharashtra — in the ratio stipulated by the 1979 award of the Narmada Water Dispute Tribunal.

    How has it saved water for summers?

    • During the monsoon from July to October, the reservoir operation is well synchronized with the rain forecast in the catchment area.
    • The strategic operation of River Bed Power House (RPBH) ensures that minimum water flows downstream into the sea and maximum water is used during the dam overflow period, which is not calculated in the annual water share.
    • These measures help in maximizing the annual allocation of water share.
    • Similarly, in non-monsoon months, the measures for efficient use of the allocated share typically include minimizing the conventional and operational losses.
    • It includes: avoiding water wastage, restricting water-intensive perennial crops, adopting of Underground Pipelines (UGPL); proper maintenance and operation of canals on a rotational basis.

  • Appointment of Election Commissioners

    President Ram Nath Kovind on Tuesday appointed of Anup Chandra Pandey, a retired Uttar Pradesh cadre IAS officer, to the post of Election Commissioner.

    Election Commission of India (ECI)

    • The ECI is a constitutional body responsible for administering elections in India according to the rules and regulations mentioned in the Constitution of India.
    • It was established on January 25, 1950.
    • The major aim of the election commission of India is to define and control the process for elections conducted at various levels, Parliament, State Legislatures, and the offices of the President and Vice President of India.
    • It can be said that the Election Commission of India ensures the smooth and successful operation of the democracy.

    Functions

    According to Article 324 of the Indian Constitution:

    • the ECI has superintendence, direction, and control of the entire process for conduct of elections to Parliament and Legislature (state legislative assembly & state legislative council) of every State and to
    • the offices of President and Vice-President of India

    Answer this PYQ in the comment box:

    Q.Consider the following statements:

    1. The Election Commission of India is a five-member body.
    2. Union Ministry of Home Affairs decides the election schedule for the conduct of both general elections and bye-elections.
    3. Election Commission resolves the disputes relating to splits/mergers of recognized political parties.

    Which of the statements given above is/are correct? (CSP 2017)

    (a) 1 and 2 only

    (b) 2 only

    (c) 2 and 3 only

    (d) 3 only

    Its composition

    • Initially, the commission had only a Chief Election Commissioner. Presently, it consists of a Chief Election Commissioner and two Election Commissioners.
    • For the first time, two additional Commissioners were appointed on 16th October 1989 but they had a very short term till 1st January 1990.
    • Afterward, on 1st October 1993, two additional Election Commissioners were appointed.
    • The concept of a multi-member Commission has been in operation since then, with decision-making power by majority vote.

    Appointment & Tenure of Commissioners

    • The President has the power to select Chief Election Commissioner and Election Commissioners.
    • They have a tenure of six years, or up to the age of 65 years, whichever is earlier.
    • They have the same status and receive pay and perks as available to Judges of the Supreme Court of India.
    • The CEC can be removed from office only through accusation by Parliament.
    • The election commissioner or a regional commissioner shall not be removed from office except on the recommendation of the CEC.

  • Operation Pangea XIV

    More than 1.10 lakh web links, including websites and online marketplaces, have been taken down in the operation Pangea XIV.

    Operation Pangea XIV

    • Code-named “Operation Pangea XIV”, the exercise was coordinated by Interpol.
    • It involved the police, customs, and health regulatory authorities of 92 countries against the sale of fake and illicit medicines and medical products.
    • Indian agencies also participated in the operation, said an official of the Central Bureau of Investigation that is the nodal body for the Interpol in the country.
    • It showed that criminals were continuing to cash in on the huge demand for personal protection and hygiene products due to the COVID-19 pandemic.

  • Supersonic flying: benefits and concerns

    The United Airlines of USA has announced it was ordering 15 Overture planes with the ability to travel at Mach 1.7, faster than the speed of sound, from the Denver-based startup Boom.

    What is a Supersonic Plane?

    • Supersonic aircraft are planes that can fly faster than the speed of sound.
    • The technology for supersonic flights is actually over 70 years old, but only recently has been used for commercial flying.
    • Before 1976, when the first commercial supersonic flight took off, the planes were used entirely for military purposes.
    • Usually, supersonic planes can travel at the speed of around 900 kmph, twice the speed of normal aircraft.

    What about the Overture supersonic plane?

    • The Overture aircraft would travel at the speed of Mach 1.7 or 1,805 kmph with a range of 4,250 nautical miles. In a single flight, it could carry 65 to 88 passengers and reach an altitude of 60,000 ft.
    • The company has expressed confidence in getting an “experimental” jet ready by 2022, start rolling out aircraft by 2025 and eventually open them for passengers by 2029.
    • It claims to build on Concorde’s legacy through faster, more efficient and sustainable technology.

    Challenges with supersonic planes

    Flying passengers at a supersonic speed is accompanied by a whole set of challenges.

    • Firstly, the costs of making “sustainable” supersonic planes are extremely high.
    • The very nature of its flying — using excessive amounts of fuel and energy — is likely to have high environmental costs.
    • Despite the use of sustainable fuels, greenhouse gas emissions are not nullified.
    • Secondly, the very speed of the planes results in producing excessive amounts of noise pollution in the environment.
    • The “Sonic Boom” created by these planes feels like an explosion to the human ear.
    • This, thus, limits where and when the supersonic planes can fly. They can only reach their actual speed until they are far enough from people and completely over the ocean.
    • Lastly, it would not be economically feasible for everyone. Only the very rich can afford supersonic planes, as a ticket is likely to be way costlier than a first-class ticket of a regular plane.

  • New geometrical lines discovered in Thar Desert

    Using satellite observations and field visits, two independent researchers from France have identified eight sites around Jaisalmer in the Thar Desert, that show linear features resembling geoglyphs.

    What are geoglyphs?

    • Geoglyphs are large, un-explained geometrical patterns on land usually proposed to be man-made features.
    • The largest concentration of geoglyphs is reported from southern Peru, covering an area of about 1,000 square km.
    • A new paper published notes that the identified geoglyphs in the Thar Desert cover an area of about 6 square km.

    Boha Geoglyphs in Thar

    • The authors’ main area of interest was Boha, a small village 40 km to the north of Jaisalmer where they noticed a series of concentric and linear features.
    • They named these features Boha geoglyphs and suggested that the features could be at least 150 years old.
    • It is however conceivable that they were built at the beginning of the British colonial period, in the middle of the 19th century.

    How are they patterned?

    • The Boha geoglyphs are clearly manmade as the main unit is a giant spiral, but they have been eroded due to the cars running over the lines lately.
    • So, they are clearly not formed by weathering or another natural phenomenon.”
    • The observed features might have been formed naturally, but degraded over time due to both natural and human-related causes.

    Degraded over time

    • The rocky terrain is home to a typical weathering feature, especially over the iron-rich sandstone and shale beds.
    • Here, extreme aridity and high temperature lead to slow geochemical translocation of minerals for centuries, such that the heavier minerals like iron and manganese move away from the lighter minerals.
    • This lead to the gradual formation of alternate bands of harder and softer mineral concentrations.
    • With time the areas with softer materials get slowly eroded, while the harder ones stand out, producing the typical concentric or box-like geometric features.

  • ‘Sea Snot’ outbreak in Turkey

    There has been growing environmental concern in Turkey over the accumulation of ‘sea snot’, a slimy layer of grey or green sludge in the country’s seas, which can cause considerable damage to the marine ecosystem.

    What is ‘Sea Snot’?

    • ‘Sea snot’ is marine mucilage that is formed when algae are overloaded with nutrients as a result of water pollution combined with the effects of climate change.
    • A ‘sea snot’ outbreak was first recorded in the country in 2007. Back then, it was also spotted in the Aegean Sea near Greece.
    • But the current outbreak in the Sea of Marmara is by far the biggest in the country’s history.
    • The nutrient overload occurs when algae feast on warm weather caused by global warming. Water pollution adds to the problem.
    • Environmental experts have said that the overproduction of phytoplankton caused by climate change and the uncontrolled dumping of household and industrial waste into the seas has led to the present crisis.

    Where has it been found?

    • Turkey’s Sea of Marmara, which connects the Black Sea to the Aegean Sea, has witnessed the largest outbreak of ‘sea snot’.
    • The sludge has also been spotted in the adjoining Black and Aegean seas.

    How badly can the crisis affect the marine ecosystem?

    • The growth of the mucilage, which floats upon the surface of the sea like brown phlegm, is posing a severe threat to the marine ecosystem of the country.
    • Divers have said that it has caused mass deaths among the fish population, and also killed other aquatic organisms such as corals and sponges.
    • The mucilage is now covering the surface of the sea and has also spread to 80-100 feet below the surface.
    • If unchecked, this can collapse to the bottom and cover the sea floor, causing major damage to the marine ecosystem.
    • Over a period of time, it could end up poisoning all aquatic life, including fishes, crabs, oysters, mussels and sea stars.

  • How blind people can navigate better using Echolocation

    A technique used by animals such as dolphins, whales, and bats to navigate their surroundings can also be used by blind people to get around better and have greater independence and well-being, researchers at Durham University in the UK have shown.

    What is Echolocation?

    • Echolocation, also called biosonar, is a biological sonar used by several animal species.
    • Echolocating animals emit calls out to the environment and listen to the echoes of those calls that return from various objects near them.
    • They use these echoes to locate and identify the objects.

    What has the new study found?

    • The same technique can help blind people locate still objects by producing clicking sounds from their mouth and hands.
    • The researchers organized a 10-week training programme, in which 12 blind and 14 sighted volunteers aged between 21 and 79 were taught click-based echolocation.
    • The volunteers were trained in distinguishing between the size of objects, orientation perception and virtual navigation.
    • At the end of the training, the participants had been able to improve their ability to navigate using clicking noises either from one’s mouth, walking cane taps or footsteps.

  • CIBER-2 Mission to count the stars in the Universe

    A NASA-funded rocket’s launch window will open at the White Sands Missile Range in New Mexico, USA. The aim of this mission is to count the number of stars that exist in the Universe.

    Answer this PYQ from CSP 2020 in the comment box:

    Q.“The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometers long, with lasers shining between the craft.” The experiment in question refers to

    (a) Voyager-2

    (b) New horizons

    (c) Lisa Pathfinder

    (d) Evolved LISA

    What is CIBER-2?

    • In order to roughly estimate the number of stars in the Universe, scientists have estimated that on average each galaxy consists of about 100 million stars, but this figure is not exact.
    • The figure of 100 million could easily be an underestimation, probably by a factor of 10 or more.
    • To put this into perspective, an average of 100 million stars in each galaxy (there an estimated 2 trillion of them as per NASA), would give a total figure of one hundred quintillion stars or 1 with 21 zeroes after it.
    • NASA notes that if this figure is accurate, it would mean that for every grain of sand on Earth, there are more than ten stars.
    • But this calculation assumes that all stars are inside galaxies, which might not be true and this is what the CIBER-2 instrument will try to find out.

    How will CIBER-2 count stars?

    • NASA notes that the instrument will not actually count individual stars but it will instead detect the extragalactic background light
    • It is all of the light that has been emitted throughout the history of the Universe.
    • From all of this extragalactic background light, the CIBER-2 will focus on a portion of this called cosmic infrared background, which is emitted by some of the most common stars.
    • Essentially, this approach is aiming to look at how bright this light is to give scientists an estimate of how many of these stars are out there.
    • The ESA infrared space observatory Herschel also counted the number of galaxies in infrared and measured their luminosity previously.